Plisko Tatiana V, Bildyukevich Alexandr V, Burts Katsiaryna S, Ermakov Sergey S, Penkova Anastasia V, Kuzminova Anna I, Dmitrenko Maria E, Hliavitskaya Tatiana A, Ulbricht Mathias
Department of Analytical Chemistry, Institute of Chemistry, St. Petersburg State University, 7/9 Universitetskaya nab., 199034 St. Petersburg, Russia.
Institute of Physical Organic Chemistry, National Academy of Sciences of Belarus, 13 Surganov str., 220072 Minsk, Belarus.
Polymers (Basel). 2020 Apr 30;12(5):1017. doi: 10.3390/polym12051017.
A novel method for one-step preparation of antifouling ultrafiltration membranes via a non-solvent induced phase separation (NIPS) technique is proposed. It involves using aqueous 0.05-0.3 wt.% solutions of cationic polyelectrolyte based on a copolymer of acrylamide and 2-acryloxyethyltrimethylammonium chloride (Praestol 859) as a coagulant in NIPS. A systematic study of the effect of the cationic polyelectrolyte addition to the coagulant on the structure, performance and antifouling stability of polysulfone membranes was carried out. The methods for membrane characterization involved scanning electron microscopy (SEM), atomic force microscopy (AFM), Fourier transform infrared spectroscopy (FTIR), contact angle and zeta-potential measurements and evaluation of the permeability, rejection and antifouling performance in human serum albumin solution and surface water ultrafiltration. It was revealed that in the presence of cationic polyelectrolyte in the coagulation bath, its concentration has a major influence on the rate of "solvent-non-solvent" exchange and thus also on the rate of phase separation which significantly affects membrane structure. The immobilization of cationic polyelectrolyte macromolecules into the selective layer was confirmed by FTIR spectroscopy. It was revealed that polyelectrolyte macromolecules predominately immobilize on the surface of the selective layer and not on the bottom layer. Membrane modification was found to improve the hydrophilicity of the selective layer, to increase surface roughness and to change zeta-potential which yields the substantial improvement of membrane antifouling stability toward natural organic matter and human serum albumin.
提出了一种通过非溶剂诱导相分离（NIPS）技术一步制备抗污染超滤膜的新方法。该方法涉及在NIPS过程中使用基于丙烯酰胺与2-丙烯酰氧乙基三甲基氯化铵共聚物（Praestol 859）的0.05-0.3 wt.%的阳离子聚电解质水溶液作为凝固剂。对在凝固剂中添加阳离子聚电解质对聚砜膜的结构、性能和抗污染稳定性的影响进行了系统研究。膜表征方法包括扫描电子显微镜（SEM）、原子力显微镜（AFM）、傅里叶变换红外光谱（FTIR）、接触角和zeta电位测量，以及在人血清白蛋白溶液和地表水超滤中对渗透率、截留率和抗污染性能的评估。结果表明，在凝固浴中存在阳离子聚电解质时，其浓度对“溶剂-非溶剂”交换速率有重大影响，从而也对相分离速率有重大影响，而相分离速率会显著影响膜结构。通过FTIR光谱证实了阳离子聚电解质大分子固定在选择性层中。结果表明，聚电解质大分子主要固定在选择性层表面而非底层。发现膜改性可提高选择性层的亲水性，增加表面粗糙度并改变zeta电位，从而显著提高膜对天然有机物和人血清白蛋白的抗污染稳定性。
